The Blackberry has long been the dominant mobile device in the enterprise world. But as time passes, iPhone and Android devices have gained popularity and are increasingly being adopted by businesses of all kinds, including hedge funds and investment firms. While making the switch from a Blackberry to an iPhone might seem like a great idea on paper, it's important to consider a variety of factors, including features and security.

We asked Jason Lisnak, one of Eze Castle's Apple experts to talk us through some of the key considerations. Here's what Jason had to say: